GetCalendarEvent Method

Retrieves a single event from the CalDAV server.

Syntax

[VB.NET]
Public Sub GetCalendarEvent(ByVal ResourceURI As String)

[C#]
public void GetCalendarEvent(string resourceURI);

Remarks

This method retrieves a single event from a CalDAV server. The ResourceURI points to the exact location of the iCal (*.ics) file you wish to retrieve. (If you do not know the URL of the event you need, you can use the GetCalendarReport method along with the ReportFilter property to find it.)

The event will be fetched using the WebDAV GET method. The full response is delivered through the Transfer event and the HTTP response headers through the Header event. After an event is retrieved with this method, the component parses the calendar data into properties. You may then edit these properties and use PutCalendarEvent to update the calendar event resource.

The following properties are used when creating a request with PutCalendarEvent or ExportICS, and will be filled after calling GetCalendarEvent or ImportICS. These will also be available from inside the EventDetails event, which is fired for each event received from the CalDAV server in response to a GetCalendarReport.

There is no standard format for resource URIs. Google for instance, uses "https://www.google.com/calendar/dav/" plus your email address to access the default calendar. So "https://www.google.com/calendar/dav/username@gmail.com/" is the base URI for the default calendar. If you have multiple calendars, replace the email address portion above with the Id of the calendar, plus "@group.calendar.google.com/". For instance: "https://www.google.com/calendar/dav/ev3nkr4ua83jej7q32oumn5eeo@group.calendar.google.com/". For Google, calendar events are stored in the "/events/" path. To retrieve a report on a calendar, you'd add "/events/" to one of the above paths. For example:

  CalDAV.GetCalendarReport("https://www.google.com/calendar/dav/username@gmail.com/events/");

Leaving the "/events/" out of the URI will result in an HTTP protocol error: 405 Method not allowed.

To add or retrieve an event, add the UID of the event you're creating or retrieving plus ".ics" to the path. Note that when putting an event with the PutCalendarEvent method, if the resourceURI and the UID do not match Google will create the event using the UID stored in the UID property. The actual location of will be newly added event will be returned in a "Location" header. This is the resource URI you must use to retrieve the event with GetCalendarEvent. For example:

  CalDAV.UID = "1234567890";
  CalDAV.PutCalendarEvent("https://www.google.com/calendar/dav/username@gmail.com/events/1234567890.ics");

Yahoo uses a different format for CalDAV access. Yahoo's ResourceURIs always start with "https://caldav.calendar.yahoo.com/dav/" plus your user name, plus "/Calendar/" plus the name of your calendar. For instance: "https://caldav.calendar.yahoo.com/dav/username/Calendar/Your_Name" for the default calendar. (Yahoo uses your name to create the default calendar). When using the CreateCalendar event to create a new calendar, replace "Your_Name" in the URI with the desired name of your new calendar. Event resources are located directly under the "/Calendar/Calendar_Name/" path. Like Google, the UID and filename portion of the resource URI must match, but Yahoo will actually return an HTTP protocol error if they differ. The examples below show a few possible transactions:

  CalDAVS1.User = "username";
  CalDAVS1.Password = "password";
  
  CalDAV.DisplayName = "My Hockey Calendar";
  CalDAV.CreateCalendar("https://caldav.calendar.yahoo.com/dav/username/Calendar/Hockey_Calendar/");
  
  CalDAV.StartDate = "20100401T040000";
  CalDAV.EndDate = "20100401T060000";
  CalDAV.UID = "qwerty1234567";
  CalDAV.Summary = "First Practice";
  CalDAV.Location = "Rink on 1st and main";
  CalDAV.EventType = vEvent;
  CalDAV.PutCalendarEvent("https://caldav.calendar.yahoo.com/dav/username/Calendar/Hockey_Calendar/qwerty1234567.ics");
  
  CalDAV.GetCalendarReport("https://caldav.calendar.yahoo.com/dav/username/Calendar/Hockey_Calendar/");

NOTE: This method has a corresponding asynchronous version (GetCalendarEventAsync) for use in the Xamarin environment.